What Is a Seamless Stainless Steel TP309 Tube?
TP309 Seamless Stainless Steel Tube is supplied for oxidation resistance for elevated-temperature service. The size range shown (OD 6–257 mm; WT 0.5–35 mm) is the overall capability across this product family, not a per-grade commitment. Confirm the specific OD × WT × length combination for the ordered grade in the quotation. The governing specification must be stated on the purchase order: ASTM A213 / ASME SA213, subject to the purchase specification. Chemistry, mechanical properties, heat treatment, dimensional tolerance, NDT and certification must be reported against the ordered standard and material heat; do not treat typical values as guaranteed acceptance limits.
Seamless TP309 stainless steel tube is manufactured from a solid billet via cold drawing or hot extrusion, resulting in:
- Uniform microstructure
- No longitudinal weld seam
- Superior pressure-bearing capability
With elevated alloy content (Cr 22–24%, Ni 12–15%), TP309 significantly outperforms standard grades such as 304 and 316 in high-temperature and scaling environments.
Key Advantages of TP309 Seamless Tube
Superior Oxidation Resistance
- Continuous service up to 1038°C (1900°F)
- Intermittent service up to 982°C (1800°F)
- Excellent resistance to scaling in oxidizing atmospheres
High-Temperature Mechanical Strength
- Good creep resistance
- Stable performance under prolonged thermal loading
Resistance to Carburization & Thermal Cycling
- Performs well in carburizing environments
- Superior to cyclic heating and cooling conditions
Seamless Structural Reliability
- No longitudinal weld seam
- Suitable for high-pressure heat exchanger and furnace systems
Good Fabrication & Weldability
- Excellent ductility
- Compatible with standard welding and forming processes
Product Specifications and Data
To provide a comprehensive overview of this high-performance material, here are the detailed technical specifications and performance data for Seamless Stainless Steel TP309 Tube.
Equivalent Grade
| UNS | Common grade name | EN material number | EN steel name | JIS grade | GB/T grade |
|---|---|---|---|---|---|
| S30908 | 309S | 1.4833 | X12CrNi23-13 | SUS309S | 06Cr23Ni13 / 0Cr23Ni13 |
Grade correspondence does not make ASTM, ASME, EN, JIS and GB delivery requirements interchangeable. Confirm chemistry, heat treatment, mechanical properties, dimensions, testing and certification against the purchase specification. Approximate or unconfirmed correspondences retain their qualification. See the grade designation index.
Chemical Composition
The composition of Stainless Steel 309 is carefully balanced to achieve its superior high-temperature oxidation resistance and strength.
| C | Si | Mn | P | S | Cr | Ni |
|---|---|---|---|---|---|---|
| ≤ 0.08 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 22.00–24.00 | 12.00–15.00 |
Data source: ASTM A213/A213M Table 1, TP309S (UNS S30908) row — heat-analysis acceptance limits: C ≤ 0.08, Mn ≤ 2.00, P ≤ 0.045, S ≤ 0.030, Si ≤ 1.00, Cr 22.0–24.0, Ni 12.0–15.0, Mo ≤ 0.75. ASTM A213 covers TP309S (S30908) and TP309H (S30909, C 0.04–0.10); there is no plain “TP309” grade row. Confirm against the ordered edition and the MTC.
Stainless Steel 309 is specifically designed to maintain its strength and shape in high-stress, high-temperature environments.
| Tensile Strength | Yield Strength | Elongation | Hardness |
|---|---|---|---|
| ≥ 515 MPa | ≥ 205 MPa | ≥ 35% | ≤ 192 HBW / 200 HV / 90 HRB |
Typical Physical Properties
These physical properties highlight the material’s ability to perform reliably under a wide range of conditions.
| Density | Melting Point | Thermal Expansion | Thermal Conductivity | Modulus of Elasticity | Electrical Resistivity |
|---|---|---|---|---|---|
| 8.0 g/cm³ | 1300 – 1390 °C approx. | 16.5 μm/m·°C (20-100°C) | 13.9 W/m·K (20°C) | 195 GPa | 0.85 × 10⁻⁶ Ω·m (20°C) |
Note: Typical values for reference only — not acceptance limits. Physical and mechanical properties are reported on the MTC against the ordered standard, product form and condition.
ASTM A1016/A1016M Tube Size Tolerance Chart
Size Tolerance Chart (mm)
| Specified Outside Diameter (OD) (Inches) | Permissible Variations in OD (± Inches) |
|---|---|
| 1⁄2 to 1 | ±0.005 |
| Over 1 to 1-1⁄2 | ±0.008 |
| Over 1-1⁄2 to 2 | ±0.010 |
| Over 2 to 2-1⁄2 | ±0.012 |
| Over 2-1⁄2 to 3-1⁄2 | ±0.014 |
| Over 3-1⁄2 to 5 | ±0.020 |
Tolerance basis: permitted variations per the governing specification stated on this page and the applicable general-requirements standard (ASTM A1016 / ASME SA1016) for the ordered product form; the wall-thickness and length variations in this section follow the same basis.
| Specified Outside Diameter (OD) (Inches) | Specified Wall Thickness (WT) (Inches) | Permissible Variation (± Inches) |
|---|---|---|
| 1⁄2 to 1 (Inclusive) | 0.025 to 0.065(Inclusive) | ±0.010 |
| Over 0.065to 0.134 (Inclusive) | ±0.012 | |
| Over 1 to 1-1⁄2 (Inclusive) | 0.025 to 0.065 (Inclusive) | ±0.010 |
| Over 0.065 to 0.134 (Inclusive) | ±0.012 | |
| Over 1-1⁄2 to 2 (Inclusive) | 0.025 to 0.049 (Inclusive) | ±0.011 |
| Over 0.049 to 0.083 (Inclusive) | ±0.012 | |
| Over 0.083 to 0.148 (Inclusive) | ±0.014 | |
| Over 2 to 2-1⁄2 (Inclusive) | 0.032 to 0.065 (Inclusive) | ±0.013 |
| Over 0.065 to 0.109 (Inclusive) | ±0.015 | |
| Over 0.109 to 0.165 (Inclusive) | ±0.017 | |
| Over 2-1⁄2 to 3-1⁄2 (Inclusive) | 0.032 to 0.165 (Inclusive) | ±0.020 |
| Over 0.165 to 0.220 (Inclusive) | ±0.025 | |
| Over 3-1⁄2 to 5 (Inclusive) | 0.083 to 0.165 (Inclusive) | ±0.025 |
| Over 0.165 to 0.220 (Inclusive) | ±0.030 |
Length Tolerance
- For Specific Cut Lengths, the standard tolerance is +1⁄8 in. [3 mm], -0 in. [0 mm].
Important Note: The values presented here are based on the dimensional tolerance tables in ASTM A1016/A1016M (General Requirements for Ferritic Alloy Steel, Austenitic Alloy Steel, and Stainless Steel Tubes), contains other essential requirements like straightness and details for tubes with ODs outside of this range. Always consult the latest official standard for design and procurement.
Typical Applications of TP309 Tubes
Industrial Furnaces
- Radiant tubes
- Furnace linings
- Mufflers and conveyors
Petrochemical Industry
- Flare systems
- Catalytic recovery units
- High-temperature heat exchangers
Power Generation
- Boiler components
- Coal handling systems
Waste & Environmental Systems
- Incinerators
- Kilns
- Combustion chambers
Cement Industry
- Burner pipes
- Kiln internals
Quality Assurance & Testing
All TP309 seamless tubes undergo strict inspection:
Non-Destructive Testing (NDT)
- PMI (Positive Material Identification)
- Eddy Current Testing (ET)
- Ultrasonic Testing (UT)
- Hydrostatic Testing
Mechanical Testing
- Flattening Test
- Flaring Test
- Hardness Test
Corrosion Testing
- Intergranular Corrosion Test
- Pitting Resistance Test
Frequently Asked Questions
What sizes are available for TP309 seamless tube?
Which specification governs TP309 seamless tube?
What inspection documents are provided?
Technical review: page data reviewed by the Xinzhe technical desk on 2026-09-27. Chemistry acceptance limits are compiled from the governing ASTM/ASME specification stated on this page; mechanical and physical values are typical reference data and are not acceptance guarantees. Values must be confirmed against the standard edition in force at order time and the material test certificate.
Ready to Request a Quotation?
Send the size (OD and wall or schedule), quantity, length, end finish and the inspection items you need as acceptance criteria — you will get a written quotation stating the specification and edition, delivery condition, documents included and lead time.
For the same grade in pipe form, see the TP309 seamless pipe. To compare other grades and size combinations, browse the Stainless Steel Seamless Pipe category. Minimum order quantity and lead time are confirmed on enquiry against the ordered grade, size and quantity.
